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The BlackRapid FastenR-3 Third Generation for R-Strap (Black) is designed to work with all R-Straps and couples to a ConnectR and ConnectR-2. It is a replacement for the fastener supplied with the RS-4, RS-5, RS-7 and RS DR1. It is made from solid stock 304 stainless steel with a high-grade rubber compression washer. It has an integrated D-ring.